US9557710B2 - Hologram transfer foil, fabrication method of image display element, image display element, and personal authentication medium - Google Patents

Hologram transfer foil, fabrication method of image display element, image display element, and personal authentication medium Download PDF

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Publication number
US9557710B2
US9557710B2 US14/518,368 US201414518368A US9557710B2 US 9557710 B2 US9557710 B2 US 9557710B2 US 201414518368 A US201414518368 A US 201414518368A US 9557710 B2 US9557710 B2 US 9557710B2
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heat
hidden information
layer
diffraction structure
structure forming
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US20150036198A1 (en
Inventor
Masami Inokuchi
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Toppan Inc
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Toppan Printing Co Ltd
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Assigned to TOPPAN PRINTING CO., LTD. reassignment TOPPAN PRINTING CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: INOKUCHI, MASAMI
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/0005—Adaptation of holography to specific applications
    • G03H1/0011—Adaptation of holography to specific applications for security or authentication
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/24—Passports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/309—Photographs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/328—Diffraction gratings; Holograms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B42D25/455—Associating two or more layers using heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B42D25/46—Associating two or more layers using pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/16—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
    • B44C1/165—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
    • B44C1/17—Dry transfer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0236—Form or shape of the hologram when not registered to the substrate, e.g. trimming the hologram to alphanumerical shape
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0252—Laminate comprising a hologram layer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0252—Laminate comprising a hologram layer
    • G03H1/0256—Laminate comprising a hologram layer having specific functional layer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/024—Hologram nature or properties
    • G03H1/0244—Surface relief holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
    • G03H1/2645—Multiplexing processes, e.g. aperture, shift, or wavefront multiplexing
    • G03H1/265—Angle multiplexing; Multichannel holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/0005—Adaptation of holography to specific applications
    • G03H1/0011—Adaptation of holography to specific applications for security or authentication
    • G03H2001/0016—Covert holograms or holobjects requiring additional knowledge to be perceived, e.g. holobject reconstructed only under IR illumination
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/0005—Adaptation of holography to specific applications
    • G03H1/0011—Adaptation of holography to specific applications for security or authentication
    • G03H2001/0027—Being copy-protected against fraudulent replication, e.g. by layering a filter rejecting laser lines
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/0493—Special holograms not otherwise provided for, e.g. conoscopic, referenceless holography
    • G03H2001/0497—Dot matrix holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2210/00—Object characteristics
    • G03H2210/50—Nature of the object
    • G03H2210/54—For individualisation of product
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2240/00—Hologram nature or properties
    • G03H2240/20—Details of physical variations exhibited in the hologram
    • G03H2240/21—Optical density variations
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2250/00—Laminate comprising a hologram layer
    • G03H2250/10—Laminate comprising a hologram layer arranged to be transferred onto a carrier body
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2270/00—Substrate bearing the hologram
    • G03H2270/20—Shape
    • G03H2270/23—Ribbon shaped, e.g. holographic foil

Definitions

  • Embodiments described herein relate generally to a hologram transfer foil which is easy to identify and difficult to counterfeit and tamper, a fabrication method of an image display element, an image display element, and a personal authentication medium.
  • an image display technique which is used for image reproduction use is made of, for example, a thermal transfer recording method by a transfer ribbon using a sublimation (thermal migratory) dye, or a resin melting type or wax melting type in which pigments are dispersed, or an electrophotography technique.
  • a face image which is recorded by using a fluorescent material, cannot be observed unless a special light source, such as an ultraviolet lamp, is used.
  • a face image which is formed by using a pearl pigment, can be recognized by the naked eye, it is difficult to form an image with high fineness by using the pearl pigment since the grain size of the pearl pigment is large.
  • Tampering of a face is easier in a case where the look of a face image recorded on a personal authentication medium is simple and there is no special visual effect, than in a case where a face image is complex and has a characteristic visual effect.
  • a face image is displayed with a simple look, it is difficult to visually determine with ease a counterfeited or tampered face image.
  • the present invention has been made in consideration of the above circumstance, and the object of the invention is to provide a hologram transfer foil which is easy to identify and difficult to counterfeit and tamper, a fabrication method of an image display element, an image display element, and a personal authentication medium.
  • a hologram transfer foil is thermally transferrable to a transfer base member.
  • the hologram transfer foil includes a structure configured such that a peeling layer, a diffraction structure forming layer and an adhesive layer are stacked on one surface of a substrate.
  • the diffraction structure forming layer includes fine concaves and convexes of a hologram or a diffraction grating.
  • At least one of the peeling layer and the adhesive layer includes heat-conductive hidden information in a heat-conductive hidden information possession portion.
  • the heat-conductive hidden information may be a geometrical pattern, a cyclically arranged two-value character pattern, or a cyclically arranged two-value graphic pattern.
  • At least one of the peeling layer and the adhesive layer may record the heat-conductive hidden information in the heat-conductive hidden information possession portion by forming concaves and convexes.
  • the heat-conductive hidden information may be recorded in the heat-conductive hidden information possession portion by an agglomeration state of an inclusion in the adhesive layer.
  • a hologram transfer foil is thermally transferrable to a transfer base member.
  • the hologram transfer foil includes a structure configured such that a peeling layer, a diffraction structure forming layer and an adhesive layer are stacked on one surface of a substrate.
  • the diffraction structure forming layer includes fine concaves and convexes of a hologram or a diffraction grating.
  • At least one of the peeling layer and the adhesive layer includes heat-conductive hidden information in a heat-conductive hidden information possession portion, and includes no hidden information in a heat-conductive hidden information non-possession portion.
  • the diffraction structure forming layer may be configured such that at least one of a spatial frequency and a grating angle is different between the heat-conductive hidden information possession portion and the heat-conductive hidden information non-possession portion.
  • the hologram transfer foil of the second embodiment is thermally transferred to the transfer base member.
  • the fabrication method of an image display element includes transferring the heat-conductive hidden information possession portion of the hologram transfer foil onto the transfer base member, transferring the heat-conductive hidden information non-possession portion of the hologram transfer foil onto the transfer base member, the heat-conductive hidden information non-possession portion including identification information.
  • the image display element is fabricated by the fabrication method of the third embodiment.
  • the image display element includes a structure configured such that an image receiving layer, an adhesive layer, a diffraction structure forming layer and a peeling layer are stacked on one surface of a substrate.
  • a personal authentication medium comprises the image display element of the forth embodiment.
  • a hologram transfer foil which is easy to identify and difficult to counterfeit and tamper, a fabrication method of an image display element, an image display element, and a personal authentication medium.
  • FIG. 1 is a plan view illustrating an example of a personal authentication medium according to an embodiment.
  • FIG. 2 is a cross-sectional view illustrating a first example of a hologram transfer foil according to the embodiment.
  • FIG. 3 is a plan view illustrating a second example of the hologram transfer foil according to the embodiment.
  • FIG. 4 is a cross-sectional view illustrating the second example of the hologram transfer foil according to the embodiment.
  • FIG. 5 is a cross-sectional view illustrating the second example of the hologram transfer foil according to the embodiment.
  • FIG. 6A is a cross-sectional view illustrating an example of a first step of a fabrication method of an image display element according to the embodiment.
  • FIG. 6B is a cross-sectional view illustrating an example of a second step of the fabrication method of the image display element according to the embodiment.
  • FIG. 7 is a cross-sectional view illustrating an example of an image display element fabricated by the fabrication method of the image display element according to the embodiment.
  • FIG. 8 is a cross-sectional view illustrating an example of a personal authentication medium on which the image display element according to the embodiment has been transferred.
  • FIG. 9 is a cross-sectional view illustrating an example of an observation state of the personal authentication medium according to the embodiment.
  • FIG. 10A is a plan view illustrating an example of identification information of the personal authentication medium according to the embodiment.
  • FIG. 10B is a plan view illustrating an example of hidden information of the personal authentication medium according to the embodiment.
  • FIG. 11 is a schematic view illustrating an example of comparison between a conventional image and an image according to the embodiment.
  • Embodiments relate to a hologram transfer foil, an image display element, a fabrication method of an image display element, and a personal authentication medium.
  • a hologram transfer foil is formed by stacking a peeling layer, a diffraction structure forming layer and an adhesive layer on one surface of a substrate.
  • the diffraction structure forming layer is formed of fine concaves and convexes of a hologram or a diffraction grating.
  • hidden information is included in a heat-conductive hidden information possession portion, and no hidden information is included in a heat-conductive hidden information non-possession portion.
  • An image display element is fabricated by thermally transferring a hologram transfer foil onto a transfer base member.
  • a fabrication method of an image display element includes recording a heat-conductive hidden information possession portion of a hologram transfer foil on a transfer base member, and recording a heat-conductive hidden information non-possession portion including identification information of the hologram transfer foil on the transfer base member.
  • the embodiment it is possible to visually confirm with ease an image for identifying a person, to prevent counterfeiting and tampering, and to realize high security.
  • FIG. 1 is a plan view which schematically illustrates an example of a personal authentication medium according to an embodiment.
  • a personal authentication medium 1 is, for example, a booklet such as a passport.
  • the personal authentication medium 1 is depicted in an open state.
  • the personal authentication medium 1 displays image information 1 a , 1 b .
  • the image information 1 a is image information which is displayed by making use of absorption of light. Specifically, the image information 1 a is an image which is visually recognizable when the image information 1 a is illuminated with white light and observed by the naked eye.
  • the image information 1 a may be composed of, for example, a dye or a pigment.
  • a thermal transfer recording method using a thermal head an ink jet recording method, an electrophotography method, or a combination of two or more of these methods.
  • the image information 1 a may be formed by forming a layer including a thermosensitive color coupler, and drawing an image on this layer by a laser beam.
  • the image information 1 a may be formed by combining the above-described various methods. At least a part of the image information 1 a may be formed by a thermal transfer recording method using a hot stamp, may be formed by a printing method, or may be formed by using a combination of these.
  • the image information 1 b is an image which is displayed by a diffraction structure of a hologram and/or a diffraction grating.
  • the image information 1 b is formed by successively performing, in the named order, thermal transfer recording using a thermal head and thermal transfer recording using a hot stamp or a heat roll.
  • the image information 1 b includes identification information with an intermediate gradation for authenticating a person, and hidden information which is recognized at a visual recognition angle which is different from a visual recognition angle of the identification information.
  • the identification information with the intermediate gradation for personal authentication is, for instance, a face image.
  • the hidden information is, for example, non-personal information such as a symbol, a code and a mark.
  • FIG. 2 is a cross-sectional view illustrating a first example of the hologram transfer foil according to the embodiment.
  • FIG. 3 is a plan view illustrating a second example of the hologram transfer foil according to the embodiment.
  • FIG. 4 and FIG. 5 are cross-sectional views illustrating the second example of the hologram transfer foil according to the embodiment.
  • a hologram transfer foil 100 , 200 is formed by successively stacking a peeling layer 12 , 22 ( 22 a , 22 b ), a diffraction structure forming layer 13 , 23 , and an adhesive layer 14 , 24 ( 24 a , 24 b ) on one surface of a substrate 11 , 21 .
  • This hologram transfer foil 100 , 200 may be applied in the form of a hologram ribbon or sheet.
  • the peeling layer 22 a is a peeling layer including no hidden information.
  • the peeling layer 22 b is a peeling layer including hidden information.
  • the adhesive layer 24 a is an adhesive layer including no hidden information.
  • the adhesive layer 24 b is an adhesive layer including hidden information.
  • the substrate 11 , 21 is, for example, a resin film or sheet.
  • the substrate 11 , 21 is formed by using, for example, a plastic material such as polyethylene terephthalate (PET), polyprophylene (PP), polycarbonate (PC), polymethylmethacrylate (PMMA), or polyethylene (PE).
  • PET polyethylene terephthalate
  • PP polyprophylene
  • PC polycarbonate
  • PMMA polymethylmethacrylate
  • PE polyethylene
  • the peeling layer 12 , 22 is formed on the substrate 11 , 21 .
  • the peeling layer 12 , 22 functions to stabilize peeling of the hologram transfer foil 100 , 200 from the substrate 11 , 21 , and to promote adhesion to a transfer base member 301 shown in FIG. 6 (to be described later).
  • the peeling layer 12 , 22 has light transmissivity, and is typically transparent.
  • a resin in which a silicone- or fluorine-based additive is added to a thermoplastic resin such as a polycarbonate resin, an acrylic resin, a fluorine-based acrylic resin, a silicone-based acrylic resin, an epoxy acrylate resin, a polystyrene resin, a cycloolefin polymer, a methylstyrene resin, a fluorene resin, PET, polypropylene, a polyethylene terephthalate resin or a poyacetal resin, a fluorine-based acrylic resin, or a silicone-based acrylic resin.
  • a thermoplastic resin such as a polycarbonate resin, an acrylic resin, a fluorine-based acrylic resin, a silicone-based acrylic resin, an epoxy acrylate resin, a polystyrene resin, a cycloolefin polymer, a methylstyrene resin, a fluorene resin, PET, polypropylene, a polyethylene terephthalate resin or a
  • the peeling layer 12 , 22 b is coated by, for example, a gravure coater.
  • a gravure coater In the coating by the gravure coater, by using a plate with a pattern as a gravure printing plate, the peeling layer 12 , 22 b with a finely varying thickness along the pattern (typically, a difference in thickness is about 0.2 ⁇ m or less) can be coated.
  • the peeling layer 22 , 22 a may be coated by a coating method of, for example, a lip coater, by which the thickness of a coated layer becomes uniform in the plane.
  • the diffraction structure forming layer 13 , 23 is formed on the peeling layer 12 , 22 .
  • a photo-curing resin such as a polycarbonate resin, an acrylic resin, a fluorine-based acrylic resin, a silicone-based acrylic resin, an epoxy acrylate resin, a polystyrene resin, a cycloolefin polymer, a methylstyrene resin, a fluorene resin, PET, polypropylene
  • a thermo-curing resin such as an acrylonitrile-styrene copolymer resin, phenol resin, melamine resin, a urea resin, or an alkyd resin.
  • the material of the diffraction structure forming layer 13 , 23 use may be made of a thermoplastic resin such as a polypropylene resin, a polyethylene terephthalate resin or a poyacetal resin.
  • a thermoplastic resin such as a polypropylene resin, a polyethylene terephthalate resin or a poyacetal resin.
  • cured resins of which the diffraction structure forming layer 13 , 23 is formed, are all light-transmissive.
  • the refractive index of the cured resin, of which the diffraction structure forming layer 13 , 23 is formed, is generally about 1.5.
  • the film thickness of the diffraction structure forming layer 13 , 23 is smaller, and this film thickness should preferably be about 1.5 ⁇ m or less.
  • the diffraction structure forming layer 13 , 23 includes a diffraction structure forming portion K 1 , K 2 of a hologram and/or a diffraction grating. Parameters of this diffraction structure forming portion K 1 , K 2 are:
  • the color, in which the shining image cell is viewed varies.
  • the direction, in which the shining image cell is viewed varies.
  • the diffraction structure forming portions K 1 , K 2 may, or may not, have different parameters of the above (1) and (2). However, preferably, at least one of the parameters (1) and (2) is different.
  • the diffraction structure forming layer 13 , 23 may include a reflective layer.
  • the reflective layer for example, a transparent reflective layer may be used.
  • the transparent reflective layer is formed by, for example, a vacuum film formation method such as vacuum evaporation or sputtering.
  • the transparent reflective layer for example, use is made of a layer including a transparent material with a refractive index which is different from the refractive index of the diffraction structure forming layer 13 , 23 .
  • the transparent reflective layer including the transparent material may be of a single-layer structure or a multilayer structure. In the case of the multilayer structure, the transparent reflective layer may be designed such that reflection/interference occurs repeatedly.
  • the transparent material use is made of, for example, a transparent dielectric material such as zinc sulfide or titanium dioxide.
  • the transparent reflective layer a metallic layer with a thickness of less than about 20 nm may be used.
  • the material of the metallic layer use is made of, for instance, an elementary metal such as chromium, nickel, aluminum, iron, titanium, silver, gold or copper, or an alloy thereof.
  • the film thickness of the transparent reflective layer should be, typically, about 50 nm or more, and about 100 nm or less.
  • the adhesive layer 14 , 24 is formed on the diffraction structure forming layer 13 , 23 .
  • a thermoplastic resin such as a, polypropylene resin, a polyethylene terephthalate resin, a poyacetal resin or polyester resin, or a material obtained by adding inorganic fine particles of silica, etc. are added to these resins.
  • the adhesive layer 14 , 24 b is coated by, for example, a gravure coater.
  • a gravure coater In the coating by the gravure coater, by using a plate with a pattern as a gravure printing plate, the adhesive layer 14 , 24 b with a slightly varying thickness along the pattern (typically, a difference in thickness is about 0.2 ⁇ m or less) can be coated.
  • the additive contained in the adhesive layer 14 , 24 b may be agglomerated along the pattern of the plate. Thereby, at a time of thermal transfer with the thermal head, the heat conductivity can be made different in accordance with the pattern of the plate.
  • the adhesive layer 24 , 24 a is coated by a coating method of, for example, a lip coater, by which the thickness of a coated layer and the state of contained inorganic fine particles become uniform in the plane.
  • FIG. 6A and FIG. 6B are cross-sectional views illustrating examples of a first step and a second step of a fabrication method of an image display element according to the embodiment.
  • an image display element 300 is fabricated by transferring the above-described hologram transfer foil 200 onto a transfer base member 301 .
  • the same fabrication method may be used in a case where the image display element is fabricated by the hologram transfer foil 100 .
  • FIG. 7 is a cross-sectional view which schematically illustrates an example of the image display element 300 fabricated by the fabrication method illustrated in FIG. 6A and FIG. 6B .
  • the hologram transfer foil 200 is first disposed on a surface of the transfer base member 301 , as illustrated in FIG. 6A , such that the substrate 21 of the hologram transfer foil 200 is located on the upper side, and the adhesive layer 24 is attached to the surface of the transfer base member 301 .
  • a thermal pressure 15 is applied to the upper surface of the hologram transfer foil 200 , between broken lines illustrated in FIG. 6A .
  • the part, to which the thermal pressure 15 is not applied is peeled from the transfer base member 301 .
  • the transfer base member 301 to which the hologram transfer foil 100 , 200 is transferred, includes a substrate 31 , a peeling layer 32 and an image receiving layer 35 .
  • the substrate 31 for example, the materials described as examples in connection with the substrate 11 , 21 can be used.
  • the peeling layer 32 for example, the materials described as examples in connection with the peeling layer 12 , 22 , can be used.
  • the image receiving layer 35 includes a material with good adhesion to the adhesive layer 14 , 24 of the hologram transfer foil 100 , 200 .
  • a heat-conductive hidden information possession portion H 2 is formed on the transfer base member 301 .
  • the heat-conductive hidden information possession portion H 2 of the hologram transfer foil 100 , 200 is thermally transferred onto the image receiving layer 35 of the transfer base member 301 .
  • a thermal head is used.
  • thermal transfer using a heat roll or a hot stamp may be performed.
  • the thermal transfer area of the heat-conductive hidden information possession portion H 2 is set to be at least 10% or more of a transfer designation area.
  • identification information with an intermediate gradation for personal authentication is formed on the transfer base member 301 .
  • the identification information with the intermediate gradation for personal authentication is printed based on image electronic information which is obtained, for example, by photographing the face of a person with use of an image-pickup device, or by scanning a face image from a photographic print.
  • the identification information such as a face image, corresponds to a heat-conductive hidden information non-possession portion H 1 .
  • the identification information is formed on the transfer base member 301 .
  • the pattern corresponding to the face image is formed by the thermal transfer using the thermal head, the pattern is typically formed by a plurality of dot shapes or line shapes.
  • the diameter of the dot-shaped portion or the line width of the line-shaped portion is within a range of, for example, about 0.085 mm or more and 0.508 mm or less (about 50 dpi (dots per inch) or more, and about 300 dpi or less), and typically within a range of about 0.085 mm or more and 0.169 mm or less (about 150 dpi or more, and about 300 dpi or less). If the diameter of the dot-shaped portion or the dimension of the line width of the line-shaped portion is increased, it becomes difficult to display a face image with high fineness. In addition, if the diameter of the dot-shaped portion or the dimension of the line width of the line-shaped portion is decreased, the reproducibility of the diameter of the dot-shaped portion or the line width of the line-shaped portion deteriorates.
  • the identification information with the intermediate gradation for personal authentication may be first formed, and subsequently the heat-conductive hidden information possession portion H 2 may be formed.
  • the heat-conductive hidden information possession portion H 2 holds, for example, hidden information.
  • the hidden information may be, for example, a cyclically arranged two-value character/graphic pattern, or a guilloche pattern. Accordingly, it is easy to distinguish the hidden information and the identification information with the intermediate gradation for personal authentication.
  • the image display element 300 is printed/rendered, as a face image or a fingerprint which is a key for personal identification, on a booklet such as a passport or a visa, or a personal authentication medium such as a card.
  • personal identification information such as the face of an authentic owner
  • a structure body provided with a diffraction structure and an on-demand printing technique
  • furthermore hidden information having a light emission angle, which is different from a light emission angle of the identification information is formed.
  • An observer who performs personal authentication, can easily perform the personal authentication by viewing the image display element 300 , and can easily disclose counterfeiting or tampering. In addition, it is difficult to counterfeit or tamper with the image display element 300 .
  • FIG. 8 is a cross-sectional view which schematically illustrates an example of a personal authentication medium 400 which is fabricated such that the image display element 300 shown in FIG. 7 is thermally transferred.
  • the personal authentication medium 400 is obtained by thermally transferring the image display element 300 shown in FIG. 7 from the substrate 31 onto a base member 41 .
  • a hot stamp is used.
  • thermal transfer using the hot stamp thermal transfer using a heat roll or a thermal head may be performed.
  • the personal authentication medium 400 is fabricated.
  • identification information (face image) 420 shown in FIG. 10A , which has an intermediate gradation for personal authentication, is observed by the observer.
  • diffraction light of the identification information 420 which has an intermediate gradation for personal authentication, is not observed by the observer, and, instead, hidden information 410 shown in FIG. 10B is observed by the observer.
  • An adhesive anchor layer for enhancing the strength of adhesion may be formed on the base member 41 .
  • the personal authentication medium 400 may be thermally transferred to the base member 41 via an adhesive layer 44 , as illustrated in FIG. 8 and FIG. 9 .
  • an adhesive ribbon is used as the adhesive layer 44 .
  • the adhesive force between the personal authentication medium 400 and the base member 41 can be increased by the provision of the adhesive layer 44 .
  • the material of the base member 41 , to which the image display element 300 is attached may be other than paper.
  • the base member 41 , to which the image display element 300 is attached may be a plastic substrate, a metallic substrate, a ceramic substrate, or a glass substrate.
  • FIG. 11 is a schematic view illustrating an example of comparison between a conventional image and an image according to the embodiment.
  • a conventional image S 1 is a hologram which is fabricated by transferring an image corresponding to the density of an image onto a conventional hologram transfer foil by a thermal head.
  • An image S 2 includes identification information S A which displays a face image, and hidden information S 2 B by, e.g. concaves and convexes (a guilloche pattern in the example of FIG. 11 ).
  • the hidden information S 2 B is formed at the same time. Conventionally, the hidden information S 2 B is not formed. Therefore, in the embodiment, a counterfeit can be discriminated, and tampering can be prevented.
  • authenticity determination can easily visually be performed.
  • hidden information can be confirmed by observation from a specific range, and the hidden information cannot be confirmed in a range different from the specific range. Therefore, authenticity determination is easy for the image display element 300 which is fabricated by transferring the hologram transfer foil 100 , 200 onto the transfer base member 301 .
  • diffraction light is emitted from the heat-conductive hidden information possession portion H 2 and heat-conductive hidden information non-possession portion H 1 under a specific illumination condition, the image of the hidden information can be confirmed in the heat-conductive hidden information possession portion H 2 , and the image of the hidden information cannot be confirmed in the heat-conductive hidden information non-possession portion H 1 .
  • the spatial frequency and/or grating angle of the hologram layer is different between the heat-conductive hidden information possession portion H 2 and heat-conductive hidden information non-possession portion H 1 .
  • diffraction light can be emitted from only the heat-conductive hidden information possession portion H 2 under a specific illumination condition.
  • the observer can confirm the image of the hidden information under the specific illumination condition.
  • diffraction light can be emitted from only the heat-conductive hidden information non-possession portion H 1 under an illumination condition other than the specific illumination condition. Under the other illumination condition, no diffraction light is emitted from the heat-conductive hidden information possession portion H 2 .
  • the observer cannot confirm the image of the hidden information under the other illumination condition.
  • the observer under the other illumination condition in the case where diffraction light is emitted from the heat-conductive hidden information non-possession portion H 1 , the observer can observe the identification information for personal authentication.
  • the specific illumination condition in the case where diffraction light is emitted from the heat-conductive hidden information possession portion H 2 the observer can observe the image of the hidden information.
  • a first hologram transfer foil (for example, the hologram transfer foil 100 shown in FIG. 2 ) is fabricated.
  • a polyethylene terephthalate film with a thickness of about 12 ⁇ m is prepared.
  • a peeling layer 12 and a diffraction structure forming layer 13 are formed in the named order on the substrate 11 by using a gravure coater.
  • a multilayer structure of the substrate 11 , peeling layer 12 and diffraction structure forming layer 13 is dried in an oven.
  • a plate of the gravure coater use is made of a plate on which a guilloche pattern of 175 lines/mm is applied.
  • an acrylic resin is used as the material of the peeling layer 12 .
  • As the material of the diffraction structure forming layer 13 acrylpolyol is used.
  • the film thicknesses of the dried peeling layer 12 and diffraction structure forming layer 13 are about 0.6 ⁇ m and 0.7 ⁇ m, respectively.
  • a diffraction structure serving as a hologram is formed on the surface of the diffraction structure forming layer 13 by thermal press using a roll emboss device.
  • the depth of the formed diffraction structure is about 100 nm.
  • the spatial frequency is about 2000/mm.
  • a transparent reflective layer containing zinc sulfide is formed by evaporation-deposition on the diffraction structure of the diffraction structure forming layer 13 .
  • the film thickness of the transparent reflective layer is about 50 nm.
  • a first hologram transfer foil including hidden information is fabricated.
  • a second hologram transfer foil which includes substantially the same structure and material as the first hologram transfer foil but does not include hidden information, is fabricated.
  • a peeling layer 12 is formed by using a lip coater and is dried in an oven.
  • the film thicknesses of the dried peeling layer 12 and diffraction structure forming layer 13 are about 0.6 ⁇ m and 0.7 ⁇ m, respectively.
  • a diffraction structure serving as a hologram with a depth of about 100 nm and a spatial frequency of about 1000/mm is formed on the surface of the diffraction structure forming layer 13 by thermal press using a roll emboss device.
  • a transparent reflective layer with a film thickness of about 50 nm, which contains zinc sulfide, is formed by evaporation-deposition on this diffraction structure
  • an image display element 300 is fabricated by the following method.
  • a polyethylene terephthalate film with a thickness of about 25 ⁇ m is prepared as a substrate 31 .
  • a peeling layer 32 and an image receiving layer 35 are formed in the named order on the substrate 31 by using a lip coater.
  • a multilayer structure of the substrate 31 , peeling layer 32 and image receiving layer 35 is dried in an oven.
  • an acrylic resin is used as the material of the peeling layer 32 .
  • acrylpolyol is used as the material of the image receiving layer 35 .
  • the film thicknesses of the dried peeling layer 32 and image receiving layer 35 are about 1.2 ⁇ m and 1.0 respectively.
  • the heat-conductive hidden information possession portion H 2 and heat-conductive hidden information non-possession portion H 1 are transferred, respectively, from the substrate 11 to the image receiving layer 35 .
  • the fabrication of the image display element 300 includes forming, at first, the transfer layer 310 corresponding to the heat-conductive hidden information possession portion H 2 so as to fill the entire surface of a predetermined transfer range, and then forming the transfer layer 320 of the heat-conductive hidden information non-possession portion H 1 by performing transfer such that the identification information (face image) with an intermediate gradation for personal authentication is disposed at the heat-conductive hidden information non-possession portion H 1 .
  • the present invention is used in fields in which counterfeiting and tampering of personal authentication media, for instance, a booklet such as a passport or a visa, or a card, is made difficult.

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  • Engineering & Computer Science (AREA)
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  • Computer Security & Cryptography (AREA)
  • Credit Cards Or The Like (AREA)
  • Holo Graphy (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Decoration By Transfer Pictures (AREA)
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EP2860589A1 (de) 2015-04-15
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